My Hyundai Sonata 2008 smells sour, when the air ventilation is set to external rather than internal.

I always immediately turn it to internal air to avoid the smell.

Where is the ventilation hole/filter and where do I need to clean?


1 Answer 1


Your Sonata has a cabin air filter (CAF). You should try to change that out first. More than likely, you have some mildew built up somewhere. The CAF is the first place to start.

  • Do you know generally how CAF are accessible?
    – ahnbizcad
    Jul 22, 2015 at 5:01

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